linux-kernel - Re: [PATCH v2 1/3] mfd: mt6397: irq domain should initialize before mfd_add

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Message-ID: <20160411085658.GN4592@x1>
Date:	Mon, 11 Apr 2016 09:56:58 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Henry Chen <henryc.chen@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	John Crispin <blogic@...nwrt.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Flora Fu <flora.fu@...iatek.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] mfd: mt6397: irq domain should initialize before
 mfd_add_devices()

On Fri, 08 Apr 2016, Henry Chen wrote:

> Some sub driver like RTC module need irq domain from parent to create
> irq mapping when driver initialize. so move mt6397_irq_init() before
> mfd_add_devices().
> 
> Acked-by: John Crispin <blogic@...nwrt.org>
> Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
> ---
> This series fixed the below warning based on "Linux kernel v4.6-rc1"
> WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
> irq_create_mapping+0xc4/0xd0
> 
> Changes in V2: Add two patch for error handle checking.
> ---
>  drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
>  1 file changed, 22 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> index 8e8d932..a879223 100644
> --- a/drivers/mfd/mt6397-core.c
> +++ b/drivers/mfd/mt6397-core.c
> @@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
>  		goto fail_irq;
>  	}
>  
> +	pmic->irq = platform_get_irq(pdev, 0);
> +
>  	switch (id & 0xff) {
>  	case MT6323_CID_CODE:
> -		pmic->int_con[0] = MT6323_INT_CON0;
> -		pmic->int_con[1] = MT6323_INT_CON1;
> -		pmic->int_status[0] = MT6323_INT_STATUS0;
> -		pmic->int_status[1] = MT6323_INT_STATUS1;
> +		if (pmic->irq > 0) {
> +			pmic->int_con[0] = MT6323_INT_CON0;
> +			pmic->int_con[1] = MT6323_INT_CON1;
> +			pmic->int_status[0] = MT6323_INT_STATUS0;
> +			pmic->int_status[1] = MT6323_INT_STATUS1;
> +			ret = mt6397_irq_init(pmic);
> +			if (ret)
> +				return ret;
> +		}
> +

I don't think you need all these ugly indenting.

Just harmlessly return in mt6397_irq_init() if there are no IRQs
present.

>  		ret = mfd_add_devices(&pdev->dev, -1, mt6323_devs,
>  				ARRAY_SIZE(mt6323_devs), NULL, 0, NULL);
>  		break;
>  
>  	case MT6397_CID_CODE:
>  	case MT6391_CID_CODE:
> -		pmic->int_con[0] = MT6397_INT_CON0;
> -		pmic->int_con[1] = MT6397_INT_CON1;
> -		pmic->int_status[0] = MT6397_INT_STATUS0;
> -		pmic->int_status[1] = MT6397_INT_STATUS1;
> +		if (pmic->irq > 0) {
> +			pmic->int_con[0] = MT6397_INT_CON0;
> +			pmic->int_con[1] = MT6397_INT_CON1;
> +			pmic->int_status[0] = MT6397_INT_STATUS0;
> +			pmic->int_status[1] = MT6397_INT_STATUS1;
> +			ret = mt6397_irq_init(pmic);
> +			if (ret)
> +				return ret;
> +		}
> +
>  		ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
>  				ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
>  		break;
> @@ -296,13 +310,6 @@ static int mt6397_probe(struct platform_device *pdev)
>  		break;
>  	}
>  
> -	pmic->irq = platform_get_irq(pdev, 0);
> -	if (pmic->irq > 0) {
> -		ret = mt6397_irq_init(pmic);
> -		if (ret)
> -			return ret;
> -	}
> -
>  fail_irq:
>  	if (ret) {
>  		irq_domain_remove(pmic->irq_domain);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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